四氧化三锰/石墨烯超级电容器的制备及分析

为了最大程度上保留石墨烯的晶格结构以提高其电导并简化过渡金属氧化物与石墨烯复合物的制备过程,通过氢电弧放电和简易的高温处理成功制备得到四氧化三锰/石墨烯纳米复合材料,并将其用作超级电容器的电极.通过XRD、Raman光谱和TEM对产物的形貌、结构及成分进行了表征.电化学测试结果表明,由该材料制得的超级电容器具有良好的电容性质、出色的电化学稳定性(循环3 000圈后大约保持96%)以及较低的等效串联电阻.同时,四氧化三锰的掺入可使其比电容提高到纯石墨烯电极的3倍.因此,此方法为制备以新型石墨烯复合过渡金属氧化物作为高性能超级电容器电极的研究提供了新思路.

Synthesis and analysis of Mn3 O4/graphene supercapacitor

In order to extremely retain the lattice structure of graphene so as to enhance its conductivity and simplify the synthesis process of transition metal oxides/graphene composites, Mn₃O₄/graphene nanocomposites were successfully prepared through a hydrogen arc discharge method and a simple high-temperature treatment, and the proposed nanocomposites were used as the electrode of supercapacitor. The morphology, structure and composition of products were characterized by x-ray diffractometer(XRD), Raman spectroscope and transmission electron microscope(TEM). The results of electrochemical tests show that the supercapacitor prepared with the Mn₃O₄/graphene nanocomposites has good capacitive behavior, excellent electrochemical stability(about 96% retention after 3 000 cycles)and lower equivalent series resistance. Furthermore, the addition of Mn₃O₄ can enhance the specific capacitance, which is three times higher than that of pure graphene electrode. Therefore, the proposed method can provide a new idea for taking the novel transition metal oxides/graphene composite as the electrode of high-performance supercapacitors.